Pack or skip
Thermal underwear for Tbilisi in April
Verdict
Skip it
Lows near 48°F — you'll overheat.
Why
Tbilisi in April averages highs of 66°F, lows of 48°F, 11 rainy days.
That climate means thermal underwear isn't pulling its weight. Lows near 48°F — you'll overheat.